Messages in this thread | | | Date | Tue, 20 Nov 2007 01:19:05 +0100 | From | Harald Dunkel <> | Subject | 2.6.23.8, ondemand scaling governor: "BUG: soft lockup detected on CPU#0!" |
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Hi folks,
using the ondemand scaling governour I see some error messages in kern.log, e.g.:
Nov 20 01:00:46 bugs kernel: BUG: soft lockup detected on CPU#0! Nov 20 01:00:46 bugs kernel: [<c013cf8d>] softlockup_tick+0x91/0xa6 Nov 20 01:00:46 bugs kernel: [<c012269c>] update_process_times+0x3a/0x5d Nov 20 01:00:46 bugs kernel: [<c0131219>] tick_sched_timer+0x115/0x164 Nov 20 01:00:46 bugs kernel: [<c012d311>] hrtimer_interrupt+0x102/0x191 Nov 20 01:00:46 bugs kernel: [<c0106cd6>] timer_interrupt+0x2e/0x34 Nov 20 01:00:46 bugs kernel: [<c013d1f6>] handle_IRQ_event+0x1a/0x3f Nov 20 01:00:46 bugs kernel: [<c013e4e1>] handle_level_irq+0xa8/0xb7 Nov 20 01:00:46 bugs kernel: [<c0106367>] do_IRQ+0x53/0x6c Nov 20 01:00:46 bugs kernel: [<c0104853>] common_interrupt+0x23/0x28 Nov 20 01:00:46 bugs kernel: [<c011007b>] smp_apic_timer_interrupt+0x1a/0x70 Nov 20 01:00:46 bugs kernel: [<c0102a36>] default_idle+0x27/0x39 Nov 20 01:00:46 bugs kernel: [<c010234c>] cpu_idle+0x46/0x68 Nov 20 01:00:46 bugs kernel: [<c032e9e8>] start_kernel+0x24d/0x252 Nov 20 01:00:46 bugs kernel: [<c032e317>] unknown_bootoption+0x0/0x196 Nov 20 01:00:46 bugs kernel: =======================
This seems to happen when the load drops below the threshold and the ondemand governor changes the CPU from 2GHz to 400MHz. If I use the "performance" governor instead, then there is no such message. If I set it back to "ondemand", then the message is printed immediately.
# uname -a Linux bugs 2.6.23.8 #1 PREEMPT Sun Nov 18 09:14:13 CET 2007 i686 GNU/Linux # cat /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 13 model name : Intel(R) Pentium(R) M processor 2.00GHz stepping : 8 cpu MHz : 400.000 cache size : 2048 KB fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 2 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov pat clflush dts acpi mmx fxsr sse sse2 ss tm pbe nx bts est tm2 bogomips : 798.34 clflush size : 64
Please mail if I can help to track this down.
Regards
Harri - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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